x1, y1, x2, y2 = list(map(float, input().split()))
dist = (((x1 - x2)**2 + (y1 - y2)**2)**(1/2))
print("{:.6f}".format(dist)) x1, y1, x2, y2 = list(map(float, input().split())) x1 list(map(float, input().split())) list map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 dist = (((x1 - x2)**2 + (y1 - y2)**2)**(1/2)) dist ((x1 - x2)**2 + (y1 - y2)**2)**(1/2) (x1 - x2)**2 + (y1 - y2)**2 (x1 - x2)**2 x1 - x2 x1 x2 2 (y1 - y2)**2 y1 - y2 y1 y2 2 1/2 1 2 print("{:.6f}".format(dist)) print "{:.6f}".format(dist) "{:.6f}".format "{:.6f}" format dist x2, y2 = list(map(float, input().split())) list(map(float, input().split())) x2 dist = (((x1 - x2)**2 + (y1 - y2)**2)**(1/2)) ((x1 - x2)**2 + (y1 - y2)**2)**(1/2) dist y1, x2, y2 = list(map(float, input().split())) list(map(float, input().split())) y1 y2 = list(map(float, input().split())) list(map(float, input().split())) y2 x1, y1, x2, y2 = list(map(float, input().split())) list(map(float, input().split())) x1
x1, y1, x2, y2 = list(map(float, input().split()))
dist = (((x1 - x2)**2 + (y1 - y2)**2)**(1/2))
print("{:.6f}".format(dist))